Nut-lock.



No 845,137. PATENTED FEB. 26 1907. w. T. SOLOMON.

NUT LOOK.

APPLICATION FILED JUNE 19. 1906.

WITNESSES. swam-ma.

{@m MU $14 m UNITED STATES PATENT OFFICE.

WILLIAM T. SOLOMON, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO ROBERT C. HALL, OF PITTSBURG, PENNSYLVANIA.

NUT-LOCK.

Specification of Letters Patent.

Patented Feb. 26, 1907.

Application filed June 19,1906. Serial No. 322,371.

To all whom it may concern:

Be it known that I, WILLIAM T. SOLOMON, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a certain new and useful Nut-Lock, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which- Figure l is a vertical sectional view illustrating my invention as applied to railroadrails and fish-bars. Fig. 2 is an elevation of a bolt showing the nut in section. Fig. 3 is an elevation of the nut, the two parts of the same being separated. Fig. 4 is a view of the bolt and the nut, partially in section, illustrating a modification. Fig. 5 is a plan View of the washer employed in the modification shown in Fig. 4, and Fig. 6 is a vertical sectional view of the same.

I will now describe my invention, so that others skilled in the art may manufacture and use the same.

1n the drawings, a is the railroad-rail, and b are the fish-bars. Extending through the fish-bars and the web of the rail is the ordinary railroad-bolt 0, having the usual righthandthread formed thereon. These parts may all be of any ordinary construction. Screwed on the end ofthe bolt is the nut d, formed in two parts 2 and 4. The part 2, which is the nut proper, is provided with the usual right-hand thread, adapted to engage with the thread of the bolt 0. The outer circumference of this nut 2 at the end which is adapted to come in contact with the fish-bar b is provided with a left-hand thread 3, adapted to receive and engage with the threaded locking-nut 4, which is provided interiorly with a left hand thread. The parts 3 and 4 when united with each other outwardly have the form of a single nut. In applying this nut d to the bolt 0 it is screwed on the bolt by a wrench in theusual manner until the face 5 of the part 4 comes in contact with the face of the lish-bar b, and the bolt 0 draws the fish-bars together exactly as in the case of the use of an ordinary nut. After the nut has been so applied, whenever the jarring to which it may be subjected tends to unscrew the part 2that is, to run it off the bolt by a motion to the left-this same jarring tendency tends to run the lock-nut 4 forward against the fish-bar by a like motion to the left, the thread being in this case a lefthand thread instead of a right-hand one, and thereby carries the part or locking-nut 4 more tightly against the fish-bar, thus creating a pressure between the interior thread (1' of the nut 2 and the thread 0 of the bolt. This pressure will increase under these opposing forces until the nut is absolutely locked against further movement.

In Figs. 4, 5, and 6 I show a modification which consists of a washer e, having a series of teeth 6, inclined to the left and adapted to engage with the face of the nut 4, and an inner series of projecting teeth 7, inclined to the right on an exterior plane, adapted to project within the part 4 without coming in contact with the same and to bear against the inner face of the nut 2. The purpose of this washer e is to give frictional bearingfaces for each part of the nut d. The washer in Figs. 4, 5. and 6, therefore, constitutes the substructure to be locked by engagement with the nut and the locking-nut, while in Fig. l the fish-plate itself is the substructure engaged directly by the nuts.

Although I have described the nut as having a right-hand thread and the nut-lock as having 'a left-hand thread, this may be reversed without departing from my invention.

The advantages of my invention will be appreciated by those skilled in the art.

The nut b may be applied to the bolt 0 with no greater effort than is required in the case of an ordinary nut, yet when so applied it will automatically lock itself whenever a jarring tendency is exerted to loosen the same. In order to unscrew the nut by means of a wrench, the part 4 should be held stationary until the part 2 is released by the wrench. Under the same rotation the speed of the part 4 will of course be greater than the speed of the part 2, the diameter of the thread portions being of different sizes. Consequently any jarring force which would tend to give the part 2 half a rotation in a direction to run it off the bolt would tend to give the part 4 a complete revolution in a direction toward locking the nut. This renders .the lock very sensitive and prevents even the commencement of a loosening of the bolt.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. A nut having an interior thread adapted to arn "the'ifn w rd' onia tlireaded bolt when 'the"'nut'is turned'in one direction,

d having an exterior threadadapted to engage with'-a;n'--in t r ior1- thre'ad-ed floc'kingnut and to carry -suc'h 1 ocking nut forward when the locking-nut is turned in a direction opposite to that which carries the nut forward on the bolt, the inner faces of the nut and the lockingnut being arranged for Irictional :en- 1 gagement with the part to belocked when in gage with ithe iface of ithe .iluckingeimt substanti'ally "as specified.

.4 The'combinationofa nut havinganin- 'terior-right han'd thread and I an exterior left- "hand thre ad, and-a'threaded'locking-nut, the

thread of which is adapted to engage with the exterior thread of the nut, and a washer arranged to engage the inner faces of said nut .andrsaidElocking-nut When in locked-position, substantially as specified.

.5. The combination of a nut having an interior right-hand thread and an-exterior lefthand thread, a vthreadedlocking-nut adapted to engage with the .exteriorthread, and "a washer having .oppositely d-irected teethconcentrica-l'ly arranged, and adapted to engage respectively with the face of the nut and the face of the locldng-nut; "substantially as specified.

In testimony whereof I have hereunto set my hand.

WILLIAM 'T. SOLOMON. Witnesses:

JAMES K. BAKEWELL, O. E. EGGERS. 

